<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            margin: 10px auto ;
            width: 100px;
            height: 100px;
            font-size: 18px;
            font-weight: bold;
        }
        input,select,button{
            font: inherit;
        }
    </style>
</head>
<body>
    <div>
        <input type="text">
        <select name="" id="">select </select>
        <button>按钮</button>
    </div>
</body>
</html>